1. Lacking brilliance or vitality
   "a dull lacklustre life"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn] 
2. Lacking lustre or shine
   "staring with lacklustre eyes"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn]

See also: dull, hebetudinous

• sodium orthophosphate
• sodium phosphate
• sodium pyrophosphate
• sodium salicylate
• sodium silicate
• sodium sulfate
• sodium sulphate
• sodium thiopental
• sodium thiosulfate
• sodium thiosulphate
• sodium tripolyphosphate
• sodium-vapor lamp
• sodium-vapour lamp
• sodoku
• sodom
• sodomise
• sodomist
• sodomite
• sodomitic
• sodomitical
• sodomize
• sodomy
• soever
• sofa
• sofa bed